Frequently asked questions

About Google Dengue Trends

What information is provided by Google Dengue Trends?
Google Dengue Trends provides near real-time estimates of dengue activity for a number of countries around the world based on aggregated search queries. The baseline level for each country is its average dengue search activity, measured over many seasons. Unless labeled "experimental", estimates have been validated through comparison with official historic dengue data from the relevant country. Generally, countries labeled as "experimental" have not been formally compared against official dengue data. Estimates can be viewed on the Google Dengue Trends website or downloaded as a CSV file for analysis. Google Dengue Trends works in a manner very similar to Google Flu Trends. Read more about how Google Flu Trends works.

How are the dengue activity levels determined?
Google Dengue Trends compares the estimates based on search data against a historic baseline level of dengue activity for that area. Depending on whether the current estimate is higher or lower than the baseline, Google Dengue Trends reports the general activity level as Minimal, Low, Moderate, High, or Intense. Each category has a corresponding color that is displayed under the graph.

How accurate and up-to-date is the information provided by Google Dengue Trends?
Historically, national estimates have been very consistent with traditional surveillance data collected by health agencies. Because Dengue Trends is still new, it's quite possible that future estimates may deviate from actual dengue activity, but we're hoping to see similar correlations in the coming years.

Is there a way to embed the charts on my own website?
Yes, from each country page click the "embed this chart" link to access the code snippet that will enable you to show that country's chart on your website.

How does Google Dengue Trends determine country of origin of search queries?
Google Dengue Trends uses IP address information from Google server logs to make a best guess about where queries originated.

For which countries does Google Dengue Trends provide estimates?
We currently have estimates for the countries shown on the home page.

What organizations provided dengue data for each country or region?

Is there a way to export the data?
Yes. The "Data" link on each country page provides the option to download the data as CSV.

How should the exported data be interpreted?
In most cases, raw numbers in each data file can be interpreted as the dengue activity index which ranges from 0 to 1. The highest activity ever seen for a place has an activity index of 1.

When are dengue activity estimates revised?
Estimates for the current week are updated daily as new search query data is collected. However, once a week is over, the estimate for that week is final and not revised. Google Dengue Trends weeks begin on Sunday and end on Saturday.

Will Google Flu Trends and Google Dengue Trends someday include other diseases?
The team found the methodology works for flu and for dengue, but there are no plans to add additional diseases at this time.

How can I send feedback about Dengue Trends?
Please share your feedback using this form.

Understanding Dengue Activity

What is dengue?
Dengue is a virus spread by mosquitoes. Symptoms include fever, skin rash, joint pain and headaches. There is currently no vaccine against this disease.

What is unique about Google's approach versus traditional collection mechanisms?
Google Dengue Trends estimates dengue activity for a number of countries by using aggregated search query data. The system provides users and public health officials with near real-time estimates of dengue activity in their region. Traditional surveillance reports come directly from doctors and other health service professionals, sometimes with a delay of weeks or months.

When does dengue season usually occur?
Dengue season varies by country, but tends to coincide with the country's rainy season.

How can I learn more about the dengue?
To learn more about dengue, please consult the Ministry of Health, World Health Organization, or dengue surveillance network for your country or region.

What should I do if there are high levels of dengue activity in my region?
Please consult the Ministry of Health or World Health Organization office in your country or region for official guidance regarding dengue.

About Google.org

Is Google Dengue Trends part of Google.org?
Yes. Google Dengue Trends is a Google.org effort.

What is Google.org?
Google.org develops technologies to help address global challenges and supports innovative partners through grants, investments and in-kind resources.

Privacy and Terms of Use

When is it okay to use the information I find on Google Dengue Trends?
You're free to use any of the information you find on Google Dengue Trends, subject to the Google Terms of Service. If you choose to use the information, please attribute it to Google as follows: "Data Source: Google Dengue Trends (http://www.google.org/denguetrends)".

This tool makes search information public. What about my personal search data?
Your personal search data remains safe and private. Our graphs are based on aggregated data from millions of Google searches over time. Moreover, the results Google Dengue Trends displays are produced by an automated system. See our Privacy Center for more about how we use search query data.

Can you tell more about what Google does with my personal search data?
Please read more at the Google Privacy FAQ.